Bài kiểm tra số chương IV môn: Đại số 9
BÀI 2. (3điểm) Cho hai hàm số y= x2 và y = x + 2
Vẽ đồ thị hai hàm số này trên cùng một mặt phẳng tọa độ
Tìm tọa độ giao điểm hai đồ thị đó (bằng đồ thị )
BÀI 3. ( 3 điểm ) Cho phương trình x2 + 4x + n – 1 = 0
a) T×m m ®Ĩ ph¬ng tr×nh c hai nghiƯm ph©n biƯt.
b) Cho bit x1 = 2. TÝnh nghiƯm con l¹i x2
c) Tìm giá trị của m để phương trình có hai nghiệm x1, x2 và x21 + x22 = 0
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Trêng THCS qu¶ng phóc Bµi kiÓm tra sè ch¬ng IV Tæ KHTN M«n: ®¹i sè 9 ******************************************************************************************************* Hä vµ tªn: ……………………………………. §iÓm Lêi phª: …………………………………………………………………… ……………………………………………………………………. ……………………………………………………………………. Líp: 9 M· §Ò:01 BAØI 1 (4 ñieåm ) Giaûi caùc phöông trình sau: a) x2 - 3x + 14 = 0 b) x2 + 14x +45 = 0 c) 2002x2 + 4x - 2006 = 0 BAØI 2. (3ñieåm) Cho hai haøm soá y= 2x2 vaø y = x + 2 Veõ ñoà thò hai haøm soá naøy treân cuøng moät maët phaúng toïa ñoä Tìm toïa ñoä giao ñieåm hai ñoà thò ñoù (baèng ñoà thò ) BAØI 3. ( 3 ñieåm ) Cho phöông trình x2 + 4x + m – 1 = 0 a) T×m m ®Ó ph¬ng tr×nh cã hai nghiÖm ph©n biÖt. b) Cho biÕt x1 = 2. TÝnh nghiÖm con l¹i x2 c) Tìm giaù trò cuûa m ñeå phöông trình coù hai nghieäm x1, x2 vaø x21 + x22 = 0 Bài làm ............................................................................................................................................................................................... ............................................................................................................................................................................................... ............................................................................................................................................................................................... ............................................................................................................................................................................................... ............................................................................................................................................................................................... ............................................................................................................................................................................................... ............................................................................................................................................................................................... ............................................................................................................................................................................................... ............................................................................................................................................................................................... ............................................................................................................................................................................................... ............................................................................................................................................................................................... ............................................................................................................................................................................................... ............................................................................................................................................................................................... ............................................................................................................................................................................................... ............................................................................................................................................................................................... ............................................................................................................................................................................................... ............................................................................................................................................................................................... ............................................................................................................................................................................................... ............................................................................................................................................................................................... ............................................................................................................................................................................................... ............................................................................................................................................................................................... ............................................................................................................................................................................................. .. Trêng THCS qu¶ng phóc Bµi kiÓm tra sè ch¬ng IV Tæ KHTN M«n: ®¹i sè 9 ******************************************************************************************************* Hä vµ tªn: ……………………………………. §iÓm Lêi phª: …………………………………………………………………… ……………………………………………………………………. ……………………………………………………………………. Líp: 9 M· §Ò: 02 BAØI 1. (4 ñieåm ) Giaûi caùc phöông trình sau: a) x2 - 6x + 14 = 0 b) x2 + 14x – 45 = 0 c) 2009x2 + 2x - 2011 = 0 BAØI 2. (3ñieåm) Cho hai haøm soá y= x2 vaø y = x + 2 Veõ ñoà thò hai haøm soá naøy treân cuøng moät maët phaúng toïa ñoä Tìm toïa ñoä giao ñieåm hai ñoà thò ñoù (baèng ñoà thò ) BAØI 3. ( 3 ñieåm ) Cho phöông trình x2 + 4x + n – 1 = 0 a) T×m m ®Ó ph¬ng tr×nh cã hai nghiÖm ph©n biÖt. b) Cho biÕt x1 = 2. TÝnh nghiÖm con l¹i x2 c) Tìm giaù trò cuûa m ñeå phöông trình coù hai nghieäm x1, x2 vaø x21 + x22 = 0 Bài làm ............................................................................................................................................................................................... ............................................................................................................................................................................................... ............................................................................................................................................................................................... ............................................................................................................................................................................................... ............................................................................................................................................................................................... ............................................................................................................................................................................................... ............................................................................................................................................................................................... ............................................................................................................................................................................................... ............................................................................................................................................................................................... ............................................................................................................................................................................................... ............................................................................................................................................................................................... ............................................................................................................................................................................................... ............................................................................................................................................................................................... ............................................................................................................................................................................................... ............................................................................................................................................................................................... ............................................................................................................................................................................................... ............................................................................................................................................................................................... ............................................................................................................................................................................................... ............................................................................................................................................................................................... ............................................................................................................................................................................................... ............................................................................................................................................................................................... BiÓu ®iÓm M· §Ò: 02
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